XSS in Nagios Xi
CVE-2024-13993
Nagios XI versions prior to < 2024R1.1.2 are vulnerable to a reflected cross-site scripting (XSS) via the login page when accessed with older web browsers. Insufficient validation or escaping of user-supplied input reflected by the login page can allow an attacker to craft a malicious link that, when visited by a victim, executes arbitrary JavaScript in the victim’s browser within the Nagios XI origin. The issue is observable under legacy browser behaviors; modern browsers may mitigate some vectors.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.007 (52.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 52.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
Weakness classification (CWE)
References
- www.nagios.com/products/security/ (vendor-advisory, patch, Vendor Advisory)
- www.nagios.com/changelog/nagios-xi/ (release-notes, Release Notes, patch)
- www.vulncheck.com/advisories/nagios-xi-reflected-xss-via-login-page-on-older-br… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2024-13993?
- CVE-2024-13993 is a medium-severity vulnerability in Nagios Xi, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2025-10-30.
- How severe is CVE-2024-13993?
- Medium severity. CVSS v3 base score is 6.1 out of 10.